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<meta name="description" content="Layout of two trees in opposite directions, assuming a single root, using TreeLayout."/> 
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<title>Double Tree</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
  <script src="../extensions/DoubleTreeLayout.js"></script>
    <script id="code">
    function init() {
      var $ = go.GraphObject.make;  // for conciseness in defining templates in this function

      myDiagram =
        $(go.Diagram, "myDiagramDiv",
          {
            layout: $(DoubleTreeLayout,
              {
                //vertical: true,  // default directions are horizontal
                // choose whether this subtree is growing towards the right or towards the left:
                directionFunction: function(n) { return n.data && n.data.dir !== "left"; }
                // controlling the parameters of each TreeLayout:
                //bottomRightOptions: { nodeSpacing: 0, layerSpacing: 20 },
                //topLeftOptions: { alignment: go.TreeLayout.AlignmentStart },
              })
          });

      // define all of the gradient brushes
      var graygrad = $(go.Brush, "Linear", { 0: "#F5F5F5", 1: "#F1F1F1" });
      var bluegrad = $(go.Brush, "Linear", { 0: "#CDDAF0", 1: "#91ADDD" });
      var yellowgrad = $(go.Brush, "Linear", { 0: "#FEC901", 1: "#FEA200" });
      var lavgrad = $(go.Brush, "Linear", { 0: "#EF9EFA", 1: "#A570AD" });

      myDiagram.nodeTemplate =
        $(go.Node, "Auto",
          { isShadowed: true },
          // define the node's outer shape
          $(go.Shape, "RoundedRectangle",
            { fill: graygrad, stroke: "#D8D8D8" },  // default fill is gray
            new go.Binding("fill", "color")),
          // define the node's text
          $(go.TextBlock,
            { margin: 5, font: "bold 11px Helvetica, bold Arial, sans-serif" },
            new go.Binding("text", "key"))
        );

      myDiagram.linkTemplate =
        $(go.Link,  // the whole link panel
          { selectable: false },
          $(go.Shape));  // the link shape

      // create the model for the double tree; could be eiher TreeModel or GraphLinksModel
      myDiagram.model = new go.TreeModel([
        { key: "Root", color: lavgrad },
        { key: "Left1", parent: "Root", dir: "left", color: bluegrad },
        { key: "leaf1", parent: "Left1" },
        { key: "leaf2", parent: "Left1" },
        { key: "Left2", parent: "Left1", color: bluegrad },
        { key: "leaf3", parent: "Left2" },
        { key: "leaf4", parent: "Left2" },
        { key: "leaf5", parent: "Left1" },
        { key: "Right1", parent: "Root", dir: "right", color: yellowgrad },
        { key: "Right2", parent: "Right1", color: yellowgrad },
        { key: "leaf11", parent: "Right2" },
        { key: "leaf12", parent: "Right2" },
        { key: "leaf13", parent: "Right2" },
        { key: "leaf14", parent: "Right1" },
        { key: "leaf15", parent: "Right1" },
        { key: "Right3", parent: "Root", dir: "right", color: yellowgrad },
        { key: "leaf16", parent: "Right3" },
        { key: "leaf17", parent: "Right3" }
      ]);
    }
    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div id="myDiagramDiv" style="background-color: white; border: solid 1px black; width: 100%; height: 500px"></div>
  <p>
    This sample displays a bow-tie diagram of two trees sharing a single root node growing in opposite directions.
    The immediate child data of the ROOT node have a "dir" property
    that describes the direction that subtree should grow.
  </p>
  <p>
    The <a>Diagram.layout</a> is an instance of the <a>DoubleTreeLayout</a> extension layout,
    defined in <a href="../extensions/DoubleTreeLayout.js">extensions/DoubleTreeLayout.js</a>.
    The layout requires a <a>DoubleTreeLayout.directionFunction</a> predicate to decide for a child node
    of the root node which way the subtree should grow.
  </p>
</div>
    </div>
    <!-- * * * * * * * * * * * * * -->
    <!--  End of GoJS sample code  -->
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